Lidar is one of the core sensors in autonomous driving vehicles. However, the mass production testing of automotive lidars currently faces challenges in terms of large space occupation and long time cost. To overcome these limitations, we develop a test instrument called lidar scene projector (LSP) to realize efficient testing and small space requirement. The LSP captures the laser pulses transmitted by the lidar within a large field of view (FOV) and generates laser return signals carrying distance, intensity, and direction information. The laser return signals are then projected to the lidar under test through a tracking scanning module to ensure real-time direction matching between the laser return signals and the lidar transmitted laser pulses. The LSP covers a FOV of 15°(horizontal) × 30°(vertical) and only occupies a space less than 1.5m×1.5m×0.5m. It can easily change the simulation distance and return signal intensity via PC. The LSP can serve as a terminal test instrument on the mass production line of automotive lidars to significantly enhance the testing efficiency.
A novel optical scene simulation method is proposed in this paper which is designed for evaluating intelligent driving systems incorporating large-array flash lidars as the 3D detector. A 3D scene is first decomposed into discrete time slice patterns and displayed on a spatial light modulator. An integrated imaging system is then used to reconstruct all time slice patterns in space into a 3D scene. We have developed a 3D lidar scene simulator with a spatial resolution of 640×512 and a distance simulation range from 0.5 meters to 32 meters, achieving a distance simulation resolution of 15mm. The method proposed in this article can significantly reduce the time and space requirements for the end-of-line testing of lidar products on automated production lines and provides an effective approach for comprehensive performance evaluation in the field of intelligent driving systems.
Broadband light absorbers are attractive for their applications in photodetection and thermal detectors. Metal-black coatings have been experimentally proven to have broadband light absorption characteristic. A large area and broadband gold-black coating was fabricated by a low-cost but effective sputtering process. The gold-black films exhibited reduced reflection of 4.81%, 2.48% and 1.93% for sputtering pressure of 50, 65 and 80 Pa in 300-800 nm spectral range, and their size reached 4- inches. A three-dimensional nanocone-like array model was proposed for the gold-black films. Then, the nanocone array of this model was embedded with many gold nanoparticles due to the rough surface of the gold-black films. The results indicated this proposed model of nanocone-like array embedded with nanoparticles can be a good tool to design broadband gold-black absorbers.
In response to the current increasing demand for calibration of low-temperature infrared radiation sources with a large dynamic range, this paper studies a calibration method for low-temperature infrared radiation sources with a temperature range of 100-450K. The improvement of the signal-to-noise ratio of the input signal by related detection techniques is analyzed. Developed a radiation calibration device, also called a radiometer, analyzed the calibration and measurement process of the radiometer, and established a corresponding mathematical model. The experimental results show that the minimum radiation intensity that can be measured by the radiometer is 2.47×10-12 W, and the response rate of the radiometer is 102878.38 V/W. Use the calibrated radiometer to measure the target simulator. The source and contribution of the uncertainty of the radiometer in the measurement process are analyzed.
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